G. LUDWIGS, the author of the treatise _Wilhelm Walloth_, Leipsic, 1891, Verlag von Wilhelm Friedrich, had in so far the advantage of Puschmann and Beck, that he was not placed under the necessity of originally demonstrating what the actual state of the nervous system of his hero was, from his works. This condition had already been established by expert physicians in a much talked of trial before the District Court of Leipsic for circulating obscene publications. Ludwigs was able therefore to proceed immediately with his problem of ascertaining the extent to which a diseased state of the nervous system had effect in Walloth’s novels and poems. His discussion of this last question possesses great interest for the psychologist, although the reader will find considerable difficulty in accommodating his thoughts to Ludwigs’s occasionally very singular style. Setting aside the odd expressions of Ludwigs, we may say that there is exhibited in a pre-eminent degree in the writings of Walloth, first, what the physicians call hyperæsthesia, and by this is meant not only an excessive sensitiveness of the senses but also—a condition that is connected with the last—an extraordinary intensity of the emotional activity. Secondly, are found numberless bold associations of ideas which are much better known to the physician than to the æsthetician. Unfortunately Walloth is not the only one of the representatives of “young Germany,” in whose works the characters of disease appear in such intensity, and the circumstance that books of this class are bought in such numbers and read in still greater, places the tastes and sentiments of a large portion of the educated German public in a questionable light.